『Abstract
Water pollution by P (phosphorus) is a serious water-related
issue being faced by mankind during the past two decades. Several
technologies already exist to remove P from contaminated water,
but each has its own drawbacks. The present paper discusses a
novel microwave-assisted synthesis of reduced iron oxide containing
renewable-resource-based media for P removal from contaminated
waters. It provides a fast, easy, and economical way to produce
reduced iron oxide nanocomposites without requiring the need for
hydrogen or inert gas during the transformation. A wide range
of other metal/ carbon nanocomposites can also be synthesized
using this technology and therefore holds tremendous economic
promise. The prepared media were highly effective and efficient
in removing P. A 100％ P removal efficiency was attained using
a 1 mg/L standard P stock solution and a maximum capacity of 43.7
mg P/g of composite was achieved using 500 mg/L standard P stock
solution. The present technology is highly economical as the carbon
source employed was a renewable resource media with a high regeneration
capacity. The present technology may also be used for arsenic
removal from similarly contaminated water. The method of preparation
of media, treatment methodology, and characterization methods
are also discussed.
Keywords: Water pollution; Phosphorus; Microwave; Iron oxide;
Renewable resource; Nanocomposite』
1. Introduction
2. Experimental
2.1. Materials
2.2. Method of preparation of magnetic nanoparticles in wood
2.3. Characterization of adsorbent
2.4. Removal methodology
2.5. Analyses
2.6. Regeneration method
3. Results and discussion
3.1. Mechanism
3.2. Scanning electron microscope analysis
3.3. X-ray diffraction analysis
3.4. Thermo gravimetric analysis
3.5. Magnetic susceptibility analysis
3.6. Removal results
3.6.1. Freundlich adsorption isotherm
3.6.2. Concentration of P vs. adsorption capacity
3.6.3. The effect of time on equilibrium concentration of P
3.7. Regeneration analysis
4. Conclusions
Acknowledgments
References